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A slippery knot just means that it is finished with a loop for the final pass instead of stuffing the end of the rope through. Means you can just yank on the end and the knot comes loose. I know it works for a half hitch, but I'm not sure I've ever made a slippery double half hitch.
Anyway,
I've found this video for a double half hitch (ignore sailing references)http://www.youtube.com/watch?v=KtbBKxJ2wkA

So, at 56 seconds into the vid, when he sticks the end of the pink rope the last time under the blue rope, you would stick a loop (a bight) of pink rope through instead.

Ok I think I may have found it. Or what I think is it. So I pretty much follow this video but at the end instead of running the bight through to make another hitch, I actually run a loop through instead. That way I can pull the tag end and the entire hitch comes undone. Does that sound about right?

Ok I think I may have found it. Or what I think is it. So I pretty much follow this video but at the end instead of running the bight through to make another hitch, I actually run a loop through instead. That way I can pull the tag end and the entire hitch comes undone. Does that sound about right?

If you want to be able to undo the whole thing with one good yank so that you're left with one strand of cord through the ring, and no knots, then at Step 3 push a bight through rather than the working end, Step 4 do the same as the video (bring the working end around the standing end, Step 5 now push a bight through the first bight , not the new "hole" just created, and Step 6 tighten it all by pulling and that last bight. The last bit you need to "do" to get the feel of it.

If you do only one bight as you suggest, then one yank will leave you with a half-hitch and the need to pull the working end out of the gap between the rope and the ring. That can be done, usually, but it can also be on the tight side.

It's not a trick question. I live in the desert and there are no trees around me so I was looking for some consensus before I head out and could possibly find out that webbing will not hold a slippery half hitch.

Vectrus cord is as slippery stuff as I have worked with. I cannot imagine
that webbing would be any slipperier, Vectrus holds a pair of slippery half-hitches, so from that point of view you're OK.

Now what might happen is that you jam a bight through a loop and it jams up as pretty as you please but the hole becomes small relative to the width of the webbing and it is harder to pull out. Still a mighty yank ought do the job.

Suggest though that you brush up on your "Hennessy Wrap" and "Speer Wrap" techniques as back up. They are proven performers on webbing, if perhaps unwieldy compared with modern techniques.

It's not a trick question. I live in the desert and there are no trees around me so I was looking for some consensus before I head out and could possibly find out that webbing will not hold a slippery half hitch.

Webbing will hold a double slipped double half hitch (like Grizz explained) or a slipped double half hitch (like the video, but slipped on the last hitch).

A better question is what are you trying to accomplish with the double slipped double half hitch? Are you tying through a ring or loop? Do you want the half hitch because it is easy to adjust and then tie? For a slack suspension (read: no structural ridgeline) there are other alternatives (like the mooring hitch); for taught suspensions (Read: Hennessey) there are other alternatives as well. But again, it depends what else you are using.

If you can explain what you are using to wrap around the tree (tree huggers) and what you use to connect them ('biner, ring, loop etc) I may be able to offer a better knot or hitch than the double slipped double half hitch.